Subaru Impreza IV ECU remapping
5 files available
About remapping
This entry covers the fourth generation of the Subaru Impreza, with 5 files in our catalogue, split between the 2.0 D and 2.2 boxer diesels and the 2.0 petrol. It is a compact with the marque's symmetrical all-wheel drive.
Stage 1 makes up 4 files, with one EGR off. The ECUs are SH7058/SH7059 and Hitachi references.
Model highlights
- ›4 Stage 1 files, split between the boxer diesels and the 2.0 petrol.
- ›A compact with symmetrical all-wheel drive.
- ›One EGR off file for maintenance work.
- ›ECUs limited to SH7058/SH7059 and Hitachi references.
Fuel split
Engines and gains
| Engine | Fuel | Stock | Stage 1 | Stage 2 |
|---|---|---|---|---|
| 2.5 WRX STI | Petrol | 300 hp | 325 hp +25 | 355 hp +55 |
| 2.5 WRX | Petrol | 265 hp | 305 hp +40 | 320 hp +55 |
| 2.0 WRX STI | Petrol | 265 hp | 294 hp +29 | — |
| 2.0 WRX | Petrol | 224 hp | 254 hp +30 | — |
| 2.0 Turbo | Petrol | 218 hp | 248 hp +30 | — |
Indicative figures from the technical catalogue; confirmed when you request the file.
Power curve
2.0 WRX STI
ECUs
ECU manufacturers
Available services
Remapping services
Stage 1
Optimising the original map with no hardware changes: more power and torque, full reliability.
EGR off
EGR valve management to reduce soot issues and improve response.
Why remap with Repromatronic
- ✓More power and torque with engine-safe tuning
- ✓Sharper throttle response and nicer driving
- ✓Potential fuel savings in normal driving
- ✓Files built from the original and 100% reversible
- ✓Made by technicians with thousands of projects behind them
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Log in as a professionalFrequently asked questions
What is the boxer diesel?
It is Subaru's horizontally opposed diesel, unique in its layout. We work on it on its own terms rather than by analogy.
Which engine gains most?
The boxer diesels, since they are turbocharged. The naturally aspirated 2.0 petrol gains considerably less.
Does it affect the all-wheel-drive system?
No. The work is done on the engine ECU and does not alter the operation of the drivetrain.